Question

1. The distance between the Earth and the Moon is [ ]

a) 3,84,400 Km b) 3,84,400 cm c) 84,000 Km d) 86,000 Km



2.The weight of an object whose mas is 1 Kg is [ ]

a) 1 Kg/m2

b) 9.8 m/Sec2

c) 9.8 N d) 9.8 N/m2


3. An object of 10 kg mass experiences acceleration due to gravity 3 m/s2

. If another object of 50

kg mass is placed at the same point, then the acceleration due to gravity: [ ]


a) 13 m/s2

b) 3 m/s2

c) 15 m/s2

d) 1/5 m/s2


4. Law of gravitation is applied to [ ]


a) Between the earth and the sun only

b) Between the earth and object on the earth only

c) Two objects having mass

d) Two objects having charges


5. The weight of an object decreases when it goes away from the earth is [ ]


a) Due to increase in distance
b) Due to increase in the mass of the earth

c) Due to increase in the mass of the object
d) Due to friction of the atmosphere


6. A thief stole a box with valuable article of weight ‘W’ and jumped down a wall of height h.

Before he reaches the ground he experienced a load of [ ]


(a) zero (b) W / 2 (c) W (d) 2 W


7. Kepler’s second law regarding constancy of arial velocity of a planet is a consequence of the

law of conservation of [ ]


(a) energy (b) angular momentum

(c) linear momentum (d) none of these


8. The distance of Neptune and Saturn from the sun are nearly 1013 m and 1012 m respectively.

Assuming that they move in circular orbits, their periodic times would be in the ratio of


(a) 10 (b) 100 (c) 10 (d) 1000 [ ]


9. The escape velocity of projection from the earth is approximately (R = 6400 km) [ ]


(a) 7 km/sec (b) 112 km/sec (c) 12.2 km/sec (d) 1.1 km/sec​

Answer 1

Answer:

1) 384,400 km

2)c) 9.8 N

6)(a) zero

7)(b) angular momentum

8)10√10

9)11.2Kms

Explanation:

this are correct answers